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210 What is the Median?

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by ern5231 » Sat Oct 10, 2009 5:55 pm
In a group of numbers, the average is 20. What is the median?
1) 50% of the numbers are less than 20
2) 50% of the numbers are more than 20
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Re: 210 What is the Median?

by fruti_yum » Sun Oct 11, 2009 4:31 am
ern5231 wrote:In a group of numbers, the average is 20. What is the median?
1) 50% of the numbers are less than 20
2) 50% of the numbers are more than 20
Is it C?

We know neither of these statements individually sufficient
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by nithi_mystics » Sun Oct 11, 2009 8:07 am
Is it E?
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by Ian Stewart » Sun Oct 11, 2009 8:14 am
Even with both statements, we don't know the median. Our set might be {18,19,21,22}, and the median might be 20, or our set might be {13, 17, 21, 29}, and our median might be 19. So the answer is E.
For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

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